3 Answers
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If your looking for readily available Django apps to integrate with your project, check out the authentication packages. Most of them that provide Facebook authentication have been updated to support the OAuth 2 protocol for some time already.

If, on the other hand, you'd like to work with a provider through an OAuth 2 library directly, take a look at python-oauth2--there's a lengthy example of how you can integrate it with Django's authentication immediately in the README.